Digi-Sense WD-20250-16 Owner's manual

Brand: Digi-Sense

Model: WD-20250-16

Category: Measuring, testing & control

Type: Owner's manual

User Manual

THE STANDARD IN PRECISION MEASUREMENT

CFM/CMM Hot-Wire Thermoanemometer

with NIST-Traceable Calibration

Model 20250-16

Max

Min

Flow

Temp

Introduction

The Digi-Sense CFM/CMM Hot-Wire Thermoanemometer (Model 20250-16)

provides precision air velocity, airﬂow, and temperature measurements. The

large, easy-to-read backlit LCD includes primary and secondary readings plus

numerous status indicators. The instrument is fully tested and calibrated to

NIST-traceable standards. Careful use of this meter will provide years of

reliable service.

Unpacking

Check individual parts against the list of items below. If anything is missing or

damaged, please contact your instrument supplier immediately.

1. Meter

2. Anemometer telescoping hot-wire probe

3. USB cable

4. Software CD

5. Hard carrying case

6. AC/DC power adapter

7. One 9 V battery

8. User manual

9. NIST-traceable calibration report with data

Features

• Thermal anemometer is capable of very low air velocity measurements

• Slim, telescoping hot-wire probe is ideal for grilles and diffusers

• Combination of hot wire and standard thermistor sensors delivers rapid and

precise measurements

• Records Max and Min readings with a recall function

• Microprocessor circuit ensures maximum possible accuracy; provides special

functions and features

• Super-large LCD with dual function allows air velocity and temperature to be

shown at the same time

• Data Hold function

• Applications: environmental testing, air conveyors, ow hoods, clean rooms,

air velocity, air balancing, fans/motors/blowers, furnace exhaust, paint spray

booths

Display Elements

1. Low-battery indicator

2. Primary Display: air velocity,

recording data, or time

3. Air velocity units

4. Secondary display units

5. Secondary display data

6. Record MAX, MIN display

7. Indicates multi-point mean

calculation mode

8. Indicates Mean value input

mode is active

9. Indicates Mean value over time

mode is active

10. The multiplier of secondary

display value

11. Flow units

12. Temperature units

13. Flow area units

14. The multiplier of primary display

value

15. Indicates Auto power-off is

active

16. Elapsed time

17. Indicates Data Hold mode is

active

18. Indicates entering or exiting

setup mode

1718

987

Changing a Setup Option

1. Press the SETUP button for 3 seconds to enter or exit

Setup mode. When the meter is in Setup mode, the

display shows SETUP (refer to Fig. 1).

2. Press UNIT  or UNIT  button to scroll to the setup

option you want to change.

3. Press ENTER button to indicate that you want to

change this setting.

4. Press UNIT  or UNIT  button until the setting you

want to use appears on the display.

5. Press ENTER button to store the new setting into memory.

Change the Area Unit of Measure Setting

1. While in Setup mode, press UNIT  or UNIT  button

to scroll to the area unit screen (refer to Fig. 2).

2. Press ENTER button. The string “AREA” and area unit

of measure will be shown on the screen.

3. Press UNIT  or UNIT  button to scroll to your

desired unit of measure (in

, m

, or ft

4. Press ENTER to store the new setting into memory.

Change the Flow Area Setting

1. While in Setup mode, press UNIT  or UNIT  button

to scroll to the AREA unit screen (refer to Fig. 2).

2. Press ENTER button to bring up the area value screen

(refer to Fig. 3).

3. Press ENTER button again and the area numbers ﬂash.

4. Press UNIT  or UNIT  button to select the place-

ment of the decimal point.

5. Press ENTER button and the ﬂashing digit will indicate

the number ready to be changed. Press UNIT  or

UNIT  button to change the ﬂashing digit from 0 to 9.

AREA

Fig. 1

AREA

Fig. 2

Fig. 3

Setup Options

Use the SETUP button to change area unit, ﬂow area, and sleep mode settings.

The meter will store the newer settings in its memory. Note: Setup mode is

disabled in MIN, MAX, and Mean modes.

6. Press the MEAN button to change the station of ﬂashing digit. Press UNIT  or

UNIT  button to change that ﬂashing digit from 0 to 9.

7. Continue until all four numbers have been changed. Then press ENTER button

to store the new setting into memory.

Auto Power-Off Mode

The meter’s default mode is to automatically shut off

after 20 minutes of non-use. To disable the auto

power-off mode, enter the Setup mode.

1. While in Setup mode, press UNIT  or UNIT  to

scroll to the “SLP ” screen (refer to Fig. 4). Press

ENTER to display “On”.

2. Press UNIT  or UNIT  button until your desired

setting appears on the display. Press ENTER to store

the new setting into memory. The Auto power-off

icon will appear in the upper right-hand corner

indicating that the auto power-off mode is activated.

Software Installation

• Insert the CD into a PC.

• Double click the setup.exe le to launch the software installation program.

• Follow the installation wizard to complete the installation.

• If the USB driver needs to be updated, please go to the folder /driver on the

CD and double click the le CP210xVCPInstaller.exe to update the driver.

Setup and Operation

Connecting the Vane

1. The vane plug is inserted in the meter’s sensor jack at the top of the meter. The

plug and jack are keyed so that the plug can only t in the jack one way.

2. Turn the plug carefully until it lines up with the jack and then rmly push the

plug in place. Do not apply undue force or try to twist the plug side-to-side.

Fig. 4

Setup and Operation (continued)

Taking Single-Point Measurements

1. Press the On/Off button to turn the

meter on and allow 5 seconds for the

thermal sensor to warm up.

2. Setting the meter to zero:

a. On the probe’s head, slide the

sensor cover to the up position to

isolate the air velocity sensor from

the environment (refer to Fig. 5).

b. Press HOLD/ZERO button until the

reading value of air velocity shows

zero.

3. Slide the sensor cover to the down

position to let the air velocity sensor

come in contact with the air (refer to

Fig. 6).

4. Extend the telescoping probe to your

desired length, up to 41"/104 cm

(refer to Fig. 7).

5. Select the desired air velocity units

and temperature units. Press the

UNIT  button to scroll through the

air velocity units of measure. Press the

UNIT  button to select either °C or °F

for temperature units.

6. Press the FLOW/TEMP button to bring

up the airﬂow display, then press

UNIT  button to select either CFM

or CMM for airﬂow units.

7. Place the probe head in the air stream.

There are two white arrows on each

side of the probe head (refer to Fig. 8).

These arrows should point in the same

direction as the airﬂow.

8. View the readings on the LCD. The

upper display shows the Air Velocity

reading. The lower display shows

the Temperature reading. Press the

FLOW/TEMP button to toggle between

viewing the Temperature reading and

the Airﬂow reading.

9. Press SETUP button to turn on the

backlight; press again to turn off.

Fig. 5

Fig. 6

Fig. 7

Fig. 8

Airﬂow

Probe handle

Taking an Averaged Measurement Over Multiple Points

1. Press MEAN button quickly and the •MEAN icon will appear at the bottom of

screen. In this mode, the upper display shows the value of the most recent data

point captured and the lower display shows the real-time probe measurement.

2. Press ENTER button to take a data point. The captured data value is shown on

the upper display while the lower display continues to show the real-time

probe measurement. A data point is captured whenever the ENTER button is

pressed.

3. To stop data collection and calculate the mean value, press MEAN button. The

•MEAN icon ﬂashes at the bottom of screen and the lower display will indicate

the calculated average value of the data taken.

4. To return to measurement mode, press MEAN button.

5. To toggle between the parameters displayed (temperature, ﬂow velocity, and

calculated volumetric ﬂow rate), press the FLOW/TEMP button.

6. To change the units of the reading displayed, press UNIT  button.

Taking an Average Measurement Over Elapsed Time

1. Press MEAN button for 2 seconds. The MEAN icon will appear at the bottom

of screen.

2. Press ENTER button to begin timing a measurement. The elapsed time (mm:ss)

is shown in the upper display, while the current reading is shown in the lower

display.

3. Press ENTER button again to stop the timing cycle. Press ENTER button again

to resume the timing cycle.

4. To end the measurement and calculate the average value, press MEAN button.

The MEAN icon will ﬂash and the calculated average value is shown in the

lower display.

5. To return to the measurement mode, press the MEAN button.

6. To toggle between the parameters displayed (temperature, ﬂow velocity, and

calculated volumetric ﬂow rate), press the FLOW/TEMP button.

7. To change the units of the reading displayed, press UNIT  button.

Holding the Displayed Readings

1. Press HOLD/ZERO button to freeze the readings on the display. The HOLD icon

will appear at top of screen, indicating that the meter is in Hold mode and the

measurement will remain unchanged.

2. To toggle between the parameters displayed (ﬂow or temperature), press the

FLOW/TEMP button.

3. Press HOLD/ZERO button again to turn off the Hold mode.

Setup and Operation (continued)

Viewing the MAX and MIN Readings

1. Press MAX/MIN button to enter the Max/Min mode. The REC MAX icon will

appear at bottom of screen.

2. Press MAX/MIN button again to toggle between the maximum displayed val-

ues (REC MAX icon) and the minimum displayed values (REC MIN icon).

3. To toggle between the parameters displayed (ﬂow or temperature), press the

FLOW/TEMP button.

4. Press MAX/MIN button and hold for 2 seconds to exit Max/Min mode.

Air velocity Range Resolution Accuracy

m/s (meters per sec) 0.1 to 25.0 m/s 0.01 m/s

±(5% + 1 digit)

reading or

±(1%+1 digit)

full scale,

whichever is

greater

ft/min (feet per min.) 20 to 4925 ft/min 1 ft/min

km/h (kilometers per hour) 0.3 to 90.0 km/h 0.1 km/h

MPH (miles per hour) 0.2 to 55.8 MPH 0.1 MPH

knots (nautical MPH) 0.2 to 48.5 knots 0.1 knots

Airflow Range Resolution Area

CFM (cubic feet per min)

0 to 99,999 ft

/min

0.001 to 100 —

CMM (cubic meters per min)

0 to 99,999 m

/min

0.001 to 100 —

Air temperature

Range Resolution Accuracy

32 to 122ºF (0 to 50ºC) 0.1ºF/C ±1.8ºF (1ºC)

CFM (ft

/min) = Air velocity (ft/min) × Area (ft

) CMM (m

/min) = Air velocity (m/s) × Area (m

) × 60

Speciﬁcations

Display 1

⁄8" x 2

⁄8" (4.7 × 6 cm) LCD, dual function

Memory Max and Min with recall

Sampling Approximately every 0.8 second

Operating temperature 32 to 122ºF (0 to 50ºC)

Operating humidity <80% RH, noncondensing

Weight 10 oz (280 g)

Dimensions 8

⁄4" x 3" x 2" (21 × 7.5 × 5 cm)

Power supply 9 V battery or 100 to 240 V, 50/60 Hz

Power current Approximately 60 to 90 mA DC

Manual Part No. 00100-55

1065DGMAN_20250-16 Rev.1

For Product and Ordering Information, Contact:

Manual Part No. 00100-55

Maintenance, Recalibration, and Repair

Battery Replacement

When low-battery icon appears on LCD, the 9 V battery must be replaced.

1. Disconnect the probe.

2. Remove the meter’s battery cover.

3. Replace the 9 V battery.

4. Close the battery compartment cover.

It is recommended that Digi-Sense products are calibrated annually to

ensure proper function and accurate measurements; however, your quality

system or regulatory body may require more frequent calibrations. To schedule

your recalibration, please contact InnoCal, an ISO 17025 calibration laboratory

accredited by A2LA.

Phone: 1-866-INNOCAL (1-866-466-6225)

Fax: 1-847-327-2993

E-mail: [email protected]

Web: InnoCalSolutions.com

sales@novatech-usa.com

www.novatech-usa.com

Tel: (866) 433-6682

Tel: (281) 359-8538

Fax: (866) 433-6684

Fax: (281) 359-0084

Digi-Sense WD-20250-16 Owner's manual

Brand: Digi-Sense

Model: WD-20250-16

Category: Measuring, testing & control

Type: Owner's manual

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Digi-Sense WD-20250-16 Owner's manual

Digi-Sense WD-20250-16 Owner's manual

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